stranta is a type of banter, however it refers specifically to a particular type. Structred banter. Banter which has been staged or set up. Non spontaneous banter.

muck-up day at school. unleashing frogs in the girls toliets, with the intent to scare others or cause someone else to be the butt of a practical joke at the expense of hilarious humour, this would be considered an act of stranta

alternatively

super-imposing someones face on an amusing picture, at the expense of the person, invocing banter of a structed variety, again this would be considered stranta.